We look at the division of 666005 by 75 
The aim is to understand the frequency of 75 in 666005.

On to step 1:
When dividing 6 by 75, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 75

On to step 2:
When dividing 66 by 75, we get 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Take the next digit (6) from the dividend and append it to 66, then repeat: 666 / 75

Step 3:
The number 75 fits into 666 8 times, leaving a remainder of 66.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 66 after subtracting 600 from 666.
Take the next digit (0) from the dividend and append it to 66, then repeat: 660 / 75

Step 4:
The number 75 fits into 660 8 times, leaving a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 88.0
The remainder is 60 after subtracting 600 from 660.
Bring next digit (0) of the dividend behind the 60 and repeat the process: 600 / 75

Moving on to step 5:
When dividing 600 by 75, we get 8 with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 888.0
The remainder is 0 after subtracting 600 from 600.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 75

Step 6:
75 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 8880.0
Deduct 0 from 5 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 7:
75 can be fit into 50 0 times, resulting in a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 8880.0
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
When dividing 500 by 75, we get 6 with a remainder of 50.
Put 6 as the next digit of the answer. 
Result so far: 8880.06
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 9:
If we divide 500 by 75, we get 6 and a remainder of 50.
Record the quotient 6 as the next digit in the result. 
Result so far: 8880.066
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 8880.066 and a remainder of 0.005.